NORTHWEST AFRICA 15581(NWA 15581)CK5CARBONACEOUS METEORITEFOUND IN APRIL 2022IN MALI 🇲🇱289GRAMS GUARANTEED AUTHENTICITY
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OFFICIAL CLASSIFICATION DATA SOURCE:
THE METEORITICAL SOCIETY
INTERNATIONAL SOCIETY FOR METEORITICS AND PLANETARY SCIENCE
LUNAR AND PLANETARY INSTITUTE
METEORITICAL BULLETIN DATABASENorthwest Africa 15581Basic informationName:Northwest Africa 15581
This is an OFFICIAL meteorite name.
Abbreviation:NWA 15581
Observed fall:No
Year found:2022
Country:(Northwest Africa)
Mass:1577 11 Apr 2024WriteupWriteup from MB 113:
Northwest Africa 15581(NWA 15581)
(Northwest Africa)
Purchased: 2022 Apr
Classification: Carbonaceous chondrite (CK5)
History: Purchased by Mbark Arjdal in April 2022 from a Malian dealer.
Petrography: (A. Irving,UWSand P. Carpenter,WUSL) Sparse well-defined, mostly porphyritic chondrules containing Cr-magnetite stained by Fe terrestrial hydroxides are set in a fine grained matrix containing stained Cr-magnetite, subcalcic augite, intermediate plagioclase and composite grains of ilmenite+Cr spinel. Minor secondary calcite, barite and Fe oxide are present.
Geochemistry: Olivine (Fa30.5±0.3, range Fa30.0-30.8, N = 5), low-Ca pyroxene (Fs27.6±1.3Wo0.9±0.4, range Fs26.6-29.2Wo0.4-1.3, Al2O33.1-5.3 wt.%, N = 4), pigeonite (Fs23.8Wo9.6, Al2O33.0 wt.%), subcalcic augite (Fs14.7Wo30.9, Al2O32.2 wt.%), plagioclase (An30.3Or2.5; An50.2Or1.0; N = 2), magnetite (Cr2O33.7-3.9 wt.%, N = 3).
Classification: Carbonaceous chondrite (CK5).
Specimens: 22.9 g plus one polished thin section atUWB; remainder with Mr. M. Arjdal.
Data from:
MB113
Table 0
Line 0:Place of purchase:MaliDate:P 2022 AprMass (g):1577Pieces:15Class:CK5Shock stage:lowWeathering grade:lowFayalite (mol%):30.6±0.3Ferrosilite (mol%):27.6±1.3Wollastonite (mol%):0.9±0.4Classifier:A. Irving, UWS, and P. Carpenter, WUSLType spec mass (g):22.9Type spec location:UWBMain mass:M. ArjdalComments:Work name Arj ZM 805; submitted by A. Irving
CK5means:
"Acarbonaceous chondriteof theCK groupthat isanomalousand petrologictype 5."
The highlighted words are defined as follows:
carbonaceous chondrite: A major class of chondrites that mostly have Mg/Si ratios near the solar value and oxygen isotope compositions that plot below the terrestrial fractionation line.
CK group : TheKaroonda (CK) chemical group of carbonaceous chondrites, distinguished by abundant fine-grained matrix (~75 vol%), mm-sized chondrules that lack igneous rims, relatively few refractory inclusions, and a high degree of oxidation; most CK chondrites have been metamorphosed to type 4 or higher.
anomalous: Designates meteorites that have been determined to be a member of a specific group, but have certain properties that are unusual or distinctive.
type 5: Designates chondrites that have been metamorphosed under conditions sufficient to homogenize olivine and pyroxene, convert all low-Ca pyroxene to orthopyroxene, cause the growth of various secondary minerals, and blur chondrule outlines.
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